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A Multi-subband Receiving Synthesis Method of SAR Echo Signal

A technology of echo signal and synthesis method, which is applied in the direction of reflection/re-radiation of radio waves, radio wave measurement system, utilization of re-radiation, etc., and can solve problems such as incoherent superposition.

Inactive Publication Date: 2017-02-01
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-subband reception synthesis method for SAR echo signals, so as to solve the problem that the subbands cannot be coherently superimposed when the subbands are synthesized, so that the echo after the compensated frequency band synthesis can be obtained very well on the range image. good compression

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  • A Multi-subband Receiving Synthesis Method of SAR Echo Signal
  • A Multi-subband Receiving Synthesis Method of SAR Echo Signal
  • A Multi-subband Receiving Synthesis Method of SAR Echo Signal

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Embodiment Construction

[0053] refer to figure 1 , the process of the present invention is as follows:

[0054] (1) Amplitude equalization processing is carried out to the dual-frequency domain data of each sub-band through range matched filtering;

[0055] Considering the high-order phase of the echo signal in the range frequency domain, the echo signal of each sub-band in the side-looking SAR mode is expressed by formula (1):

[0056] s n ( t r ) = A n · [ a n ( t r - 2 R ( t ) C ) exp ( jπK r ( t r ...

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Abstract

The invention relates to a multi-sub-band reception synthetic method for SAR echo signals. In the method, a matching function Hncomp is used to perform azimuth matching filtering processing on double-frequency-domain data, which undergo range direction matching filtering, of a corresponding sub-band; performing IFFT on azimuth data of each sub-band and performing range direction PGA processing after obtaining echo data which undergo azimuth compression so as to obtain a range direction high-order phase error of each sub-band; performing azimuth IFFT on the double-frequency-domain data, which undergo range direction matching filtering, of each sub-band, and using estimated range direction high-order phase errors to perform compensation; taking out overlapping parts of adjacent sub-bands to perform a conjugate multiplication operation and then taking phases for first-order fitting so as to obtain constant and linear phase errors; using obtained low-order phase errors to perform compensation on corresponding frequency bands and splicing data of each sub-band which undergoes the compensation in an azimuth time domain range frequency domain and finally synthesizing ultra wideband signals which are great in coherence in the whole bandwidth.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to a multi-subband receiving and synthesizing method of SAR echo signals. Background technique [0002] Synthetic Aperture Radar (SAR) obtains high-resolution images by coherently accumulating echo data. It has the characteristics of all-weather, all-time, independent range resolution and long-range imaging. These characteristics make SAR can significantly improve the information acquisition ability of radar. The range resolution of SAR is determined by the bandwidth of the chirp signal transmitted by the radar system. In a high-resolution synthetic aperture radar system, in order to ensure the resolution in the range direction, the required bandwidth can usually reach more than 2 GHz. [0003] However, if an ultra-wideband echo signal is directly received, the receiver is required to have a very flat amplitude-frequency response within the entire bandwidth, and its phase-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/292G01S13/90
CPCG01S7/2923G01S13/9017
Inventor 唐禹徐宗志邢孟道
Owner XIDIAN UNIV
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